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    submit: TxDescriptor<
        {
            update: {
                attested_header: {
                    body_root: SizedHex<32>;
                    parent_root: SizedHex<32>;
                    proposer_index: bigint;
                    slot: bigint;
                    state_root: SizedHex<32>;
                };
                block_roots_branch: SizedHex<32>[];
                block_roots_root: SizedHex<32>;
                finality_branch: SizedHex<32>[];
                finalized_header: {
                    body_root: SizedHex<32>;
                    parent_root: SizedHex<32>;
                    proposer_index: bigint;
                    slot: bigint;
                    state_root: SizedHex<32>;
                };
                next_sync_committee_update?: {
                    next_sync_committee: {
                        aggregate_pubkey: SizedHex<48>;
                        pubkeys: FixedSizeArray<512, SizedHex<48>>;
                    };
                    next_sync_committee_branch: SizedHex<32>[];
                };
                signature_slot: bigint;
                sync_aggregate: {
                    sync_committee_bits: SizedHex<64>;
                    sync_committee_signature: SizedHex<96>;
                };
            };
        },
    >

    Submits a new finalized beacon header update. The update may contain the next sync committee.